'use strict';

function choose_no_common_elements(collection_a, collection_b) {
    let collection=[];
    let sum=0;
    for(let i=0;i<collection_a.length;i++)
      {
        sum=0;
        for(let j=0;j<collection_b.length;j++)
          {
            
            if(collection_a[i]==collection_b[j])
              sum+=1;
          }
        if(sum==0)
          collection.push(collection_a[i]);
      }
    return collection;
  //在这里写入代码
}

module.exports = choose_no_common_elements;
